WO2013089385A1 - Imaging lens - Google Patents

Imaging lens Download PDF

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Publication number
WO2013089385A1
WO2013089385A1 PCT/KR2012/010511 KR2012010511W WO2013089385A1 WO 2013089385 A1 WO2013089385 A1 WO 2013089385A1 KR 2012010511 W KR2012010511 W KR 2012010511W WO 2013089385 A1 WO2013089385 A1 WO 2013089385A1
Authority
WO
WIPO (PCT)
Prior art keywords
lens
imaging lens
refractive power
imaging
conditional expression
Prior art date
Application number
PCT/KR2012/010511
Other languages
English (en)
French (fr)
Inventor
Byoung Yun YEON
Original Assignee
Lg Innotek Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Lg Innotek Co., Ltd. filed Critical Lg Innotek Co., Ltd.
Priority to US14/361,192 priority Critical patent/US9477066B2/en
Priority to CN201280061562.6A priority patent/CN103988108B/zh
Publication of WO2013089385A1 publication Critical patent/WO2013089385A1/en
Priority to US15/282,477 priority patent/US9829680B2/en

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
    • G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
    • G02B13/004—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having four lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B3/02—Simple or compound lenses with non-spherical faces
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B9/00—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -
    • G02B9/34—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having four components only
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B9/00—Exposure-making shutters; Diaphragms
    • G03B9/02—Diaphragms
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
    • G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B2003/0093—Simple or compound lenses characterised by the shape
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/0025—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for optical correction, e.g. distorsion, aberration
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/005—Diaphragms

Definitions

  • teachings in accordance with exemplary embodiments of this invention relate generally to an imaging lens.
  • Vigorous research efforts are being made recently in the field of a mobile phone-purpose camera module, a digital still camera (DSC), a camcorder, and a PC camera (an imaging device attached to a person computer) all connected with an image pickup system.
  • DSC digital still camera
  • PC camera an imaging device attached to a person computer
  • One of the most important components for a camera module related to the image pickup system to obtain an image is an imaging lens that produces an image.
  • an optical lens system is constructed by using 3 or 4 pieces of lenses for realization of compactness and low cost.
  • the 4-piece lens system may be advantageous in terms of price, but in some cases, an image module of the above-mentioned structure fails to show satisfactory optical properties or aberration properties, and thus a high resolution imaging lens having a power structure is required.
  • embodiments of the present invention may relate to an imaging lens that substantially obviates one or more of the above disadvantages/problems due to limitations and disadvantages of related art, and the present invention is to provide an imaging lens configured to realize a super-slim size with a high resolution.
  • an imaging lens comprising, in an ordered way from an object side: a first lens having a positive (+) refractive power; a second lens having a negative (-) refractive power; a third lens having a positive (+) refractive power; and a fourth lens having a negative (-) refractive power and having a negative (-) refractive power from a lens center to a lens ambience.
  • the first lens has a meniscus shape to an object side surface.
  • the second lens has a concave shape at both sides.
  • the third lens has a convex shape to an image side surface.
  • the fourth lens has a meniscus shape from an optical axis to an object side surface.
  • the imaging lens meets a conditional expression of f3C/f3L >0, where a refractive power at a lens center of the third lens is f3C, and a refractive power at lens ambience of the third lens is f3L.
  • the imaging lens meets a conditional expression of f4C/f4L >0, where a refractive power at a lens center of the fourth lens is f4C, and a refractive power at lens ambience of the fourth lens is f4L.
  • the imaging lens meets a conditional expression of 1 ⁇ ⁇ f3/f4 ⁇ ⁇ 1.3, where a focal distance of the third lens is f3, and a focal distance of the fourth lens is f4.
  • the imaging lens meets a conditional expression of 0.5 ⁇ ⁇ f4/f ⁇ ⁇ 1.0, where an entire focus distance of the imaging lens is f, and a focus distance of the fourth lens is f4.
  • the imaging lens meets a conditional expression of 0.7 ⁇ R7/f ⁇ 1.2, where an entire focus distance of the imaging lens is f, and
  • a radius of curvature of an object side surface of the fourth lens is R7.
  • the imaging lens meets a conditional expression of 0 ⁇ R8/f ⁇ 0.5, where an entire focus distance of the imaging lens is f, and a radius of curvature of an image side surface of the fourth lens is R8.
  • the imaging lens meets a conditional expression of 1 ⁇ (R7+R8)/(R7-R8) ⁇ 3, where a radius of curvature of an object side surface of the fourth lens is R7, and a radius of curvature of an image side surface of the fourth lens is R8.
  • the imaging lens further comprises an aperture stop positioned at an object side surface of the first lens.
  • the imaging lens meets a conditional expression of TL / f ⁇ 1.25, where a distance from the aperture stop to an image surface is TL, and an entire focus distance of the imaging lens is f.
  • the imaging lens meets a conditional expression of (R1+R2)/(R1-R2) ⁇ 0, where a radius of curvature of an object side surface of the first lens is R1, and a radius of curvature of an image side surface of the first lens is R2.
  • the imaging lens meets a conditional expression of 0 ⁇ (R3+R4)/(R3-R4) ⁇ 1, where a radius of curvature of an object side surface of the second lens is R3, and a radius of curvature of an image side surface of the second lens is R4.
  • a distance from an aperture stop to an image surface is less than 4mm.
  • an imaging lens comprising, in an ordered way from an object side: a first movable lens having a positive (+) refractive power; a second lens having a negative (-) refractive power; a third lens having a positive (+) refractive power; and a fourth lens having a negative (-) refractive power, and the imaging lens meets a conditional expression of f3C/f3L >0, where a refractive power at a lens center of the third lens is f3C, and a refractive power at lens ambience of the third lens is f3L.
  • the fourth lens has a meniscus shape from an optical axis to an object side surface.
  • an imaging lens comprising, in an ordered way from an object side: a first movable lens having a positive (+) refractive power; a second lens having a negative (-) refractive power; a third lens having a positive (+) refractive power; and a fourth lens having a negative (-) refractive power, and the imaging lens meets a conditional expression of f4C/f4L >0, where a refractive power at a lens center of the fourth lens is f4C, and a refractive power at lens ambience of the fourth lens is f4L.
  • the imaging lens according to the present invention has an advantageous effect in that 4 sheets of lenses are configured to realize a super-slim imaging lens with a high resolution.
  • FIG. 1 is a constructional view illustrating a camera lens module according to an exemplary embodiment of the present invention.
  • FIGS. 2a and 2b are graphs illustrating changes in refractivity relative to lens height of a third lens according to an exemplary embodiment of the present invention.
  • FIGS. 3a and 3b are graphs illustrating changes in refractivity relative to lens height of a fourth lens according to an exemplary embodiment of the present invention.
  • FIGS. 4a and 4b are graphs illustrating a measured coma aberration according to an exemplary embodiment of the present invention.
  • FIGS.5a, 5b and 5c are graphs illustrating aberration according to an exemplary embodiment of the present invention.
  • FIG. 1 is a constructional view illustrating a camera lens module according to an exemplary embodiment of the present invention
  • FIGS. 2a and 2b are graphs illustrating changes in refractivity relative to lens height of a third lens according to an exemplary embodiment of the present invention
  • FIGS. 3a and 3b are graphs illustrating changes in refractivity relative to lens height of a fourth lens according to an exemplary embodiment of the present invention.
  • the imaging lens formed with a plurality of lenses is arranged about an optical axis according to an exemplary embodiment of the present invention, where thickness, size, and shape of each lens are rather overdrawn in FIG.1 for description, and a spherical shape or an aspheric shape has been only presented as one exemplary embodiment, but obviously not limited to this shape.
  • a camera lens module includes, in an ordered way from an object side, a first lens (10), a second lens (20), a third lens (30), a fourth lens (40), a filter (50) and a photo-detector (not shown).
  • Light corresponding to image information of a subject is incident on the photo-detector by passing the first lens (10), the second lens (20), the third lens (30), the fourth lens (40) and the filter (50).
  • object side surface means a surface of a lens facing an object side with respect to an optical axis
  • image side surface means a surface of a lens facing a capturing surface with respect to an optical axis
  • the first lens (10) has a positive (+) refractive power, and the first lens (10) has a meniscus shape to an object side surface.
  • the second lens (20) has a negative (-) refractive power and has a concave shape at both sides.
  • the third lens (30) has a positive (+) refractive power, and the third lens (30) has a convex shape to an image side surface.
  • a lens center of the fourth lens (40) has a negative (-) refractive power, and takes a meniscus shape from an optical axis to an object side surface, and has a negative (-) refractive power all the way from the lens center to a lens ambience. That is, as shown in FIG.3a, light is diverged in the fourth lens (40) and the fourth lens (40) has a negative (-) refractive power, as shown in FIG.3b.
  • the imaging lens according to the present invention can realize a super-slim imaging lens with a high resolution configured with 4 sheets of lenses.
  • 'S1' and 'S2' of FIG.1 are respectively an object side surface and an image side surface of the first lens (10), 'S2' and 'S4' are respectively an object side surface and an image side surface of the second lens (20), 'S5' and 'S6' are respectively an object side surface and an image side surface of the third lens (30), 'S7' and 'S8' are respectively an object side surface and an image side surface of the fourth lens (40), 'S9' and 'S10' are respectively an object side surface and an image side surface of the filter (50).
  • the filter (50) may be any one optical filter selected from an infrared filter and a cover glass.
  • the filter (50) if applied with the infrared filter, prevents radiant heat emitted from external light from being transferred to the photo-detector. Furthermore, the infrared filter transmits visible light and reflects and outputs infrared rays to the outside.
  • the photo-detector is an image sensor, for example, CCD (Charge Coupled Device) or CMOS (Complementary Metal Oxide Semiconductor), etc.
  • conditional expressions and exemplary embodiments are preferred embodiments enhancing an effect of interaction, it would be obvious to those skilled in the art that the present invention is not necessarily comprised of the following conditions. For example, only by satisfying some conditions of later-described conditional expressions, the lens construction (framework) of the present invention may have an enhanced effect of interaction.
  • R1 a radius of curvature of an object side surface of the first lens
  • R2 a radius of curvature of an image side surface of the first lens
  • R3 a radius of curvature of an object side surface of the second lens
  • R4 a radius of curvature of an image side surface of the second lens
  • R7 a radius of curvature of an object side surface of the fourth lens
  • R8 a radius of curvature of an image side surface of the fourth lens
  • positions of the aperture stop are in the order of aperture, the first lens, the second lens, the third lens and the fourth lens. That is, the aperture stop is positioned at an object side surface of the first lens. Furthermore, a distance from the aperture stop to the image surface may be less than 4mm.
  • Aspheric mentioned in a later- exemplary embodiment is obtained from a known Equation 1, and ⁇ E and its succeeding number ⁇ used in Conic constant k and aspheric coefficient A, B, C, D, E, F indicates 10's power.
  • E+01 denotes 10.sup.1
  • E-02 denotes 10.sup.-2.
  • c basic curvature of a lens
  • Y distance towards a direction perpendicular to an optical axis
  • K conic constant
  • A, B, C, D, E, F aspheric coefficients
  • Table 1 shows an exemplary embodiment matching the aforementioned conditional expressions.
  • f1/fzl is 0.73 that matches the conditional expression 1
  • ⁇ f2/fzl ⁇ is 0.95 that matches the conditional expression 8.
  • Table 2 shows an exemplary embodiment which is a more detailed exemplary embodiment over that of Table 1.
  • FIGS. 4a and 4b are graphs illustrating a measured coma aberration according to an exemplary embodiment of the present invention, where tangential aberration and sagittal aberration of each wavelength based on a field height are measured.
  • a coma aberration correcting function is good as curves approach the X axis from a positive axis and a negative axis.
  • coma aberration correction function demonstrates a superior figure.
  • FIGS.5a, 5b and 5c are graphs illustrating aberration according to an exemplary embodiment of the present invention, where longitudinal spherical aberration, astigmatic field curves and distortion are measured in order from left side.
  • a Y axis means size of an image
  • an X axis means focal distance (unit: mm) and distortion degree (unit: %).
  • an aberration correcting function is good as curves approach the Y axis.
  • spherical aberration, astigmatic field curves and distortion all demonstrate a superior figure.
  • a range of the longitudinal spherical aberration is -0.026mm ⁇ +0.0125mm
  • a range of astigmatic field curves is -0.023mm ⁇ +0.015mm
  • a range of distortion is -1.04mm ⁇ +1.25mm, such that the imaging lens according to the present invention can correct the characteristics of spherical aberration, astigmatic field curves and distortion, whereby the imaging lens according to the present invention has an excellent lens characteristics.
  • the imaging lens according to the exemplary embodiments of the present invention has an industrial applicability in that 4 sheets of lenses are configured to realize a super-slim imaging lens with a high resolution.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)
PCT/KR2012/010511 2011-12-13 2012-12-06 Imaging lens WO2013089385A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US14/361,192 US9477066B2 (en) 2011-12-13 2012-12-06 Imaging lens
CN201280061562.6A CN103988108B (zh) 2011-12-13 2012-12-06 成像镜头
US15/282,477 US9829680B2 (en) 2011-12-13 2016-09-30 Imaging lens

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2011-0133870 2011-12-13
KR1020110133870A KR101899037B1 (ko) 2011-12-13 2011-12-13 촬상 렌즈

Related Child Applications (2)

Application Number Title Priority Date Filing Date
US14/361,192 A-371-Of-International US9477066B2 (en) 2011-12-13 2012-12-06 Imaging lens
US15/282,477 Continuation US9829680B2 (en) 2011-12-13 2016-09-30 Imaging lens

Publications (1)

Publication Number Publication Date
WO2013089385A1 true WO2013089385A1 (en) 2013-06-20

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2012/010511 WO2013089385A1 (en) 2011-12-13 2012-12-06 Imaging lens

Country Status (5)

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US (2) US9477066B2 (zh)
KR (1) KR101899037B1 (zh)
CN (1) CN103988108B (zh)
TW (1) TWI608246B (zh)
WO (1) WO2013089385A1 (zh)

Cited By (1)

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CN103969791A (zh) * 2013-12-09 2014-08-06 玉晶光电(厦门)有限公司 光学成像镜头及应用此镜头的电子装置

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KR101899037B1 (ko) * 2011-12-13 2018-10-04 엘지이노텍 주식회사 촬상 렌즈
CN106471414B (zh) * 2014-08-28 2019-06-07 大族激光科技产业集团股份有限公司 光学镜头
CN104459838A (zh) * 2014-11-18 2015-03-25 南京联河讯光电科技有限责任公司 微型联合光具组用第四镜片
CN104459836A (zh) * 2014-11-18 2015-03-25 南京联河讯光电科技有限责任公司 微型联合光具组用第三镜片
CN104483724A (zh) * 2014-11-19 2015-04-01 南京联河讯光电科技有限责任公司 包含5枚镜片的微型联合光具组用第一镜片
JP5815907B1 (ja) * 2015-07-09 2015-11-17 エーエーシーアコースティックテクノロジーズ（シンセン）カンパニーリミテッドＡＡＣ Ａｃｏｕｓｔｉｃ Ｔｅｃｈｎｏｌｏｇｉｅｓ（Ｓｈｅｎｚｈｅｎ）Ｃｏ．，Ｌｔｄ 撮像レンズ
CN109655999B (zh) * 2018-12-31 2021-01-08 诚瑞光学(常州)股份有限公司 摄像光学镜头

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Publication number Priority date Publication date Assignee Title
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TWI503567B (zh) * 2013-12-09 2015-10-11 玉晶光電股份有限公司 光學成像鏡頭及應用此鏡頭之電子裝置

Also Published As

Publication number Publication date
KR101899037B1 (ko) 2018-10-04
CN103988108A (zh) 2014-08-13
US9829680B2 (en) 2017-11-28
US9477066B2 (en) 2016-10-25
KR20130067044A (ko) 2013-06-21
TW201333516A (zh) 2013-08-16
TWI608246B (zh) 2017-12-11
US20140355137A1 (en) 2014-12-04
US20170017062A1 (en) 2017-01-19
CN103988108B (zh) 2017-02-15

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